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### 47 Cards in this Set

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 Wave Created by a vibration; a disturbance that transfers energy throught matter and empty space. Medium Matter; the stuff waves travel through. Transverse Wave A wave where the medium moves at right angles to the motion of the wave Compression Wave Awave where the medium moves at rigin the same direction as the motion of the wave Amplitude The amount of energy a wave transfers Crest Highest point of a transverse wave. Trough Lowest point of a transvserse wave Wavelength of Transverse wave The length of one wave - includes one crest and one trough. Measured in cm etc. Amplitude of Transverse wave The height of the crest or the depth of the trough of a transverese wave. rest position The horizontal line that show what the medium is like before the wave disturbes it. Compression The dense or squeezed part of a compression wave Rarefaction The spread out or less dense area of a compression wave Amplitude of a Compression wave Measures by how tightly packed the particles of the medium are in the compression Wavelenght of a Compression Wave The distance between one compression and one rarefaction Frequency the number of waves past a point in1 second. unit: hertz (hz) Diffraction The bending of a wave when it goes around a barrier Resonance The ability of an object to vibrate by absorbing energy at its natural frequency. Interference The combining of two or more waves. either constructive or destructive. Refraction The bending of a wave as it moves from one medium to another Reflection The bouncing back of a wave when it hits a barrier Doppler Effect The change in frequency or pitch that occurs when the source of a sound wave is moving relative to the observer Intensity of sound The amount of energy a sound wave carries measure in decibels. dB Loudness of sound How human perceive the intensity of a sound wave Pitch How humans perceive the frequency of sound waves. Pitch and Frequency have a positive relationship. resonator A hollow air filled space that amplifies sound when it is vibrated Sonar Man made device that uses sound to determine the location and distance to objects under water. Ultrasonic Frequencies above human hearing; above 20,000hz Electromagnetic wave Waves created by vibration electron that can travel thru a vacuum or a medium. A wide variety of frequencies and wavelengths are possible gamma ray Highest energy electromagnetic wave. Very short wavelength and very high frequency infrared wve electromagnetic waves we associate with radiant heat. Wavelenght and frequency just below human sight. Ultra violet rays electromagnetic waves with wavelengths and frequecies just above human vision. Harmful Radiowaves electromagnetic wave with longest wavelenghts and frequencies Microwaves a specific type of radio wave used for cooking food and transmitting data Visible light The part of the electromagnetic spectrum humans can see. ROYGBV X-rays electromagnetic waves with wavelengths that a just longer then gamma rays. Penetrate skin opaque Material that does not allow light to be transmitted translucent Material that allows light to be transmitted thru it but not clearly Wax paper, frosted glass transparent Materal that allows to be clearly transmitted thru it. Concave mirror Reflects light from a surface that is curved inward. Can magnify objects or create light beams Concave lens diverges light ray to form smaller, upright virtual images. Thinnger in the middle and thicker on the edge. Convex mirror Reflects light from a surface that curves outwards adn forms smaller upright, virtual images. Convex lens Converges light rays; thicker in the middle than the edges can form real and virtual images virtual image upright reflected image your brain understands but no light passes thru it real image Upside down opitical image formed when light passes throught an object LASER Device that produces coherent light and is used in medical treatments and in industry and science. coherent light Light with one wavelength that travels with all crest and troughs lined up Symbol for wavelength λ